Pet toothbrush



FIG. 1 is a perspective view of a pet toothbrush in accordance with my design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is an end view thereof; and,

FIG. 7 is an opposite end view thereof. 

CLAIM I claim the ornamental design for a pet toothbrush, as shown and described. 